At the beginning of Remarks
IV in GA97, Heidegger quotes Gottfried Wilhelm Leibniz with the sentence (GA
97, page 325):

"Qui me non nisi editisnovit, non me novit."

"He who knows me only from my publications does
not know me.”

”Unlike the methods of historical philology, which has
its own task, this is a thinking dialogue coming under other laws. These are
more vulnerable. “GA 3, dated: Freiburg i. Br., im
Juni 1950, page XVII.). GA 3. Kant und das Problem der Metaphysik (1929).

“9. Objection to the book: I have even today
still not enough enemies—it has not brought me a Great enemy.” (PonderingsII-VI: Black Notebooks, page 8). Martin Heidegger.

“People are waiting for the
second volume of Being and Time; I am waiting for this waiting to cease
and for people to finally confront the first volume.
(Ponderings II-VI: Black Notebooks, page 135). Martin Heidegger.

“Tell me which thinker you have chosen as an “opponent” and how you

have
chosen that one, and I will tell you how far you yourself have entered into the
domain of thinking.”(Ponderings II-VI: Black Notebooks, page 275).
Martin Heidegger.

Heidegger wrote, “…all
philosophy from first to last merely unfolds its presupposition.”
In his Hegel’s Phenomenology of Spirit, et. page 36).
Clearly, Heidegger wrote this in the context of Hegel.

In Contributions to Philosophy
Heidegger wrote:

“If we ponder this task of the other
beginning (the question of the ”meaning” of Seyn in the formulation of Being and Time (1927)),
then it will also become clear that al attempts that
react against metaphysics – which is everywhere idealistic, even as positivism
– persist in being re-active and thus are in principle dependent upon
metaphysics and thereby remain themselves metaphysics. “ (Contributions to
Philosophy (VomEreignis). et.
p.122)

Martin Heidegger thought that Nietzsche proper (die eigentlichePhilosophie) philosophy
was in the unpublished (Nachlass) writings and not in
Nietzsche’s published works.“Nietzsche in the works which he saw published. ... a final form and was not itself published in any book,
neither in the decade between 1879 and 1889 nor during the years preceding. ...
His philosophy proper was left behind as posthumous, unpublished
work.” (MH).